INVESTIGATION OF ULTRASONIC RELAXATION ABSORPTION IN MOLECULAR CRYSTALS

By taking into account the transitions between all the neighbouring energy levels of the internal oscillators, a new calculation of ultrasonic absorption coefficients in molecular crystals is given. The ultrasonic absorption coefficients for molecular crystal naphthalene are estimated for different temperatures in terms of the improved theory. Good agreement is found between the predicted values and experimental results on the temperature dependence of absorption coefficient.